bricko writes: "More realistic calculations, based on the underlying physical principles8 that take into account changes in available energy, humidity and wind speed, suggest that there has been little change in drought over the past 60 years.

What does this mean?

For one, it means that a widely accepted and oft-repeated consensus position expressed in the IPCC 2007 now appears to have been incorrect. This should not be unexpected as a consensus position is a snapshot of perspectives, and in science, perspectives can change based on new evidence and study. The IPCC SREX, published earlier this year had already stepped back from the conclusions of the IPCC AR4."